:root {
  /* Color palette */
  --primary-color: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #60a5fa;
  --secondary-color: #9333ea;
  --secondary-dark: #7e22ce;
  --secondary-light: #c084fc;
  --accent-color: #f59e0b;
  --accent-dark: #d97706;
  --accent-light: #fbbf24;
  --success-color: #10b981;
  --success-dark: #059669;
  --error-color: #ef4444;
  --error-dark: #dc2626;
  --dark-color: #1f2937;
  --dark-color-light: #374151;
  --gray-color: #6b7280;
  --light-color: #f3f4f6;
  --white-color: #ffffff;
  --black-color: #000000;
  
  /* Typography */
  --heading-font: 'Montserrat', sans-serif;
  --body-font: 'Merriweather', serif;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --gradient-secondary: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  --gradient-accent: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  --gradient-dark: linear-gradient(135deg, var(--dark-color), var(--dark-color-light));
  --gradient-overlay: linear-gradient(to bottom, rgba(0,0,0,0.7), rgba(0,0,0,0.4));
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  
  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Base styles */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  color: var(--dark-color);
  line-height: 1.7;
  overflow-x: hidden;
  background-color: var(--white-color);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading-font);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
}

.section-padding {
  padding: var(--spacing-xl) 0;
}

@media (min-width: 768px) {
  .section-padding {
    padding: var(--spacing-xxl) 0;
  }
}

.bg-light {
  background-color: var(--light-color);
}

.bg-gradient {
  background: var(--gradient-primary) !important;
  color: var(--white-color);
}

.text-white {
  color: var(--white-color) !important;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--gray-color);
  margin-bottom: var(--spacing-lg);
}

.bg-gradient .section-subtitle {
  color: rgba(255, 255, 255, 0.8);
}

/* Button styles */
.btn {
  display: inline-block;
  font-family: var(--heading-font);
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(1px);
}

.btn-gradient {
  background-image: var(--gradient-primary);
  color: var(--white-color);
  border: none;
}

.btn-gradient:hover {
  background-image: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
  color: var(--white-color);
}

.btn-outline-light {
  color: var(--white-color);
  border: 2px solid var(--white-color);
  background-color: transparent;
}

.btn-outline-light:hover {
  background-color: var(--white-color);
  color: var(--primary-color);
}

.btn-outline-primary {
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  background-color: transparent;
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  color: var(--white-color);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* Navbar */
.navbar {
  transition: all var(--transition-normal);
  padding: 1rem 0;
  background-color: transparent;
}

.navbar.scrolled {
  background-color: var(--dark-color);
  padding: 0.5rem 0;
  box-shadow: var(--shadow-md);
}

.navbar-brand {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.5rem;
}

.gradient-text {
  background-image: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.navbar-dark .navbar-nav .nav-link {
  color: rgba(255, 255, 255, 0.8);
  font-family: var(--heading-font);
  font-weight: 500;
  padding: 0.5rem 1rem;
  transition: color var(--transition-fast);
}

.navbar-dark .navbar-nav .nav-link:hover {
  color: var(--white-color);
}

/* Hero Section */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  color: var(--white-color);
}

.hero-section .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: var(--gradient-overlay);
  z-index: 1;
}

.hero-section .container {
  position: relative;
  z-index: 2;
}

.hero-section h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

@media (min-width: 768px) {
  .hero-section h1 {
    font-size: 3.5rem;
  }
}

.hero-section p {
  font-size: 1.2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.scroll-down {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}

.scroll-down a {
  display: inline-block;
  transform: rotate(45deg);
}

.scroll-down span {
  display: block;
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--white-color);
  border-bottom: 2px solid var(--white-color);
  margin: -10px;
  animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
  0% {
    opacity: 0;
    transform: rotate(45deg) translate(-20px, -20px);
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: rotate(45deg) translate(20px, 20px);
  }
}

/* Parallax effect */
.parallax-section {
  background-attachment: fixed;
}

/* Course Cards */
.course-card {
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.course-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  position: relative;
  height: 250px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.course-card:hover .card-image img {
  transform: scale(1.05);
}

.progress-indicator {
  position: absolute;
  top: 10px;
  right: 10px;
  left: 10px;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: rgba(255, 255, 255, 0.8);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
}

.progress-indicator .progress {
  flex-grow: 1;
  margin-right: 10px;
  height: 8px;
}

.progress-indicator .progress-bar {
  background-image: var(--gradient-primary);
}

.rating {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--dark-color);
}

.course-card .card-body {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.course-card .badge {
  background-image: var(--gradient-primary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-sm);
  font-size: 0.75rem;
}

.course-card .card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--dark-color);
}

.course-card .card-text {
  color: var(--gray-color);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
}

.duration {
  color: var(--gray-color);
  font-size: 0.85rem;
}

/* Timeline */
.timeline {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.timeline::after {
  content: '';
  position: absolute;
  width: 6px;
  background-image: var(--gradient-primary);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -3px;
}

.timeline-item {
  padding: 10px 40px;
  position: relative;
  width: 50%;
  box-sizing: border-box;
  margin-bottom: var(--spacing-lg);
}

.timeline-item:nth-child(odd) {
  left: 0;
}

.timeline-item:nth-child(even) {
  left: 50%;
}

.timeline-dot {
  position: absolute;
  width: 20px;
  height: 20px;
  right: -10px;
  background-image: var(--gradient-primary);
  border-radius: 50%;
  z-index: 1;
}

.timeline-item:nth-child(even) .timeline-dot {
  left: -10px;
}

.timeline-content {
  padding: var(--spacing-md);
  background-color: var(--white-color);
  position: relative;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.timeline-content h3 {
  font-size: 1.3rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

@media screen and (max-width: 767px) {
  .timeline::after {
    left: 31px;
  }
  
  .timeline-item {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
    left: 0 !important;
  }
  
  .timeline-dot {
    left: 21px !important;
  }
}

/* Instructor Cards */
.instructor-card {
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.instructor-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.instructor-card .card-image {
  height: 300px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.instructor-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.instructor-card:hover .card-image img {
  transform: scale(1.05);
}

.instructor-card .card-body {
  padding: var(--spacing-md);
  text-align: center;
}

.instructor-card .card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 5px;
}

.instructor-card .specialty {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 5px;
}

.instructor-card .university {
  color: var(--gray-color);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-sm);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.social-link {
  display: inline-block;
  width: 36px;
  height: 36px;
  line-height: 36px;
  text-align: center;
  border-radius: 50%;
  background-color: var(--light-color);
  color: var(--primary-color);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background-color: var(--primary-color);
  color: var(--white-color);
}

/* Research Cards */
.research-card {
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
}

.research-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.research-card .card-body {
  padding: var(--spacing-lg);
}

.research-card .card-title {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.research-card .university {
  color: var(--gray-color);
  font-size: 0.9rem;
  font-style: italic;
}

/* Project Cards */
.project-card {
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.project-card .card-image {
  height: 250px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .card-image img {
  transform: scale(1.05);
}

.project-card .card-body {
  padding: var(--spacing-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.project-card .card-title {
  font-size: 1.2rem;
  color: var(--primary-color);
  margin-bottom: 5px;
}

.project-card .students {
  color: var(--gray-color);
  font-size: 0.85rem;
  font-style: italic;
  margin-bottom: var(--spacing-sm);
}

/* Resource Cards */
.resource-card {
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
  height: 100%;
}

.resource-card:hover {
  transform: translateY(-5px);
}

.resource-card .card-body {
  padding: var(--spacing-md);
}

.resource-card .card-title {
  font-size: 1.3rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--light-color);
}

.resource-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.resource-list li {
  margin-bottom: 12px;
}

.resource-list a {
  display: block;
  padding: 8px 15px;
  background-color: var(--light-color);
  border-radius: var(--radius-md);
  color: var(--dark-color);
  transition: all var(--transition-fast);
}

.resource-list a:hover {
  background-color: var(--primary-light);
  color: var(--white-color);
  transform: translateX(5px);
}

/* Team Cards */
.team-card {
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.team-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.team-card .card-image {
  height: 300px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.team-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.team-card:hover .card-image img {
  transform: scale(1.05);
}

.team-card .card-body {
  padding: var(--spacing-md);
  text-align: center;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.team-card .card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 5px;
}

.team-card .position {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* Testimonial Cards */
.testimonial-card {
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
  height: 100%;
}

.testimonial-card:hover {
  transform: translateY(-5px);
}

.testimonial-card .card-body {
  padding: var(--spacing-lg);
}

.testimonial-rating {
  color: var(--accent-color);
  margin-bottom: var(--spacing-sm);
}

.testimonial-text {
  font-style: italic;
  margin-bottom: var(--spacing-md);
  position: relative;
}

.testimonial-text::before {
  content: '"';
  font-size: 3rem;
  position: absolute;
  top: -20px;
  left: -10px;
  color: rgba(0, 0, 0, 0.1);
  font-family: sans-serif;
}

.testimonial-author {
  display: flex;
  align-items: center;
}

.testimonial-author img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin-right: 15px;
  object-fit: cover;
}

.testimonial-author h4 {
  font-size: 1.1rem;
  margin: 0;
}

.testimonial-author p {
  color: var(--gray-color);
  font-size: 0.85rem;
  margin: 0;
}

/* Contact Section */
.contact-info {
  padding: var(--spacing-lg);
  background-color: var(--white-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  height: 100%;
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

.contact-item {
  display: flex;
  margin-bottom: var(--spacing-md);
}

.contact-item i {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-right: var(--spacing-sm);
}

.contact-item h4 {
  font-size: 1.1rem;
  margin: 0 0 5px 0;
}

.contact-item p {
  margin: 0;
  color: var(--gray-color);
}

.contact-form-wrapper {
  padding: var(--spacing-lg);
  background-color: var(--white-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  height: 100%;
}

.contact-form .form-label {
  font-weight: 600;
  color: var(--dark-color);
}

.contact-form .form-control,
.contact-form .form-select {
  padding: 12px 15px;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.contact-form .form-control:focus,
.contact-form .form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Footer */
.footer-section {
  background-color: var(--dark-color);
  color: var(--white-color);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-bottom: 10px;
}

.footer-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 50px;
  height: 3px;
  background-image: var(--gradient-primary);
}

.footer-text {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: var(--white-color);
  padding-left: 5px;
}

.footer-divider {
  border-color: rgba(255, 255, 255, 0.1);
  margin: var(--spacing-lg) 0;
}

.copyright {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.85rem;
}

.footer-section .social-link {
  display: inline-block;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  margin-right: 15px;
  transition: color var(--transition-fast);
}

.footer-section .social-link:hover {
  color: var(--primary-light);
  transform: translateY(-3px);
}

.footer-subscribe .form-control {
  background-color: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--white-color);
}

.footer-subscribe .form-control::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.footer-subscribe .btn {
  border-color: var(--white-color);
}

/* Success page */
.success-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-lg);
}

.success-icon {
  font-size: 5rem;
  color: var(--success-color);
  margin-bottom: var(--spacing-md);
}

.success-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.success-message {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

/* Terms & Privacy pages */
.content-page {
  padding-top: 100px;
}

.content-page .container {
  max-width: 800px;
}

.content-page h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

.content-page h2 {
  font-size: 1.8rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.content-page p {
  margin-bottom: var(--spacing-md);
}

.content-page ul {
  margin-bottom: var(--spacing-md);
}

/* AOS animations enhancement */
[data-aos] {
  pointer-events: none;
}

[data-aos].aos-animate {
  pointer-events: auto;
}

/* Media Queries */
@media (max-width: 991px) {
  .section-title {
    font-size: 2rem;
  }
  
  .hero-section h1 {
    font-size: 2.5rem;
  }
}

@media (max-width: 767px) {
  .section-title {
    font-size: 1.8rem;
  }
  
  .hero-section h1 {
    font-size: 2rem;
  }
  
  .section-padding {
    padding: var(--spacing-lg) 0;
  }
  
  .contact-info, 
  .contact-form-wrapper {
    margin-bottom: var(--spacing-md);
  }
}

/* Microanimations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.animate-fadeIn {
  animation: fadeIn var(--transition-normal);
}

.animate-slideInUp {
  animation: slideInUp var(--transition-normal);
}

.animate-pulse {
  animation: pulse 2s infinite;
}